Ignite Creation Date:
2024-05-05 @ 11:45 AM
Last Modification Date:
2024-10-26 @ 9:13 AM
Study NCT ID:
NCT00124826
Status:
COMPLETED
Last Update Posted:
2006-02-01
First Post:
2005-07-26
Brief Title:
SELESTIAL Trial of Insulin to Control Blood Sugar After Acute Stroke Using Magnetic Resonance Imaging MRI End-Points
Sponsor:
University of Glasgow
Organization:
University of Glasgow
Study Overview
Official Title:
Spectroscopic Evaluation of Lesion Evolution in Stroke Trial of Insulin for Acute Lactic Acidosis SELESTIAL
Status:
COMPLETED
Status Verified Date:
2005-07
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
High blood sugar hyperglycaemia affects 40 of acute stroke patients and has a major adverse effect on survival and recovery Increased production of lactic acid in brain tissue that has a poor blood supply is postulated to be the mechanism by which high blood sugar may worsen brain injury after stroke Treatment with insulin infusions is proposed as a neuroprotective strategy and a clinical trial is ongoing to test this hypothesis However the biological basis for insulin treatment has not been established and there is uncertainty about the duration of insulin infusion that may be required to limit damage
Magnetic resonance spectroscopy MRS is a brain scanning technique that allows measurement of brain lactic acid When performed in conjunction with conventional MRI scanning the relationship of lactate accumulation to stroke expansion can be established SELESTIAL is a randomised placebo-controlled trial of insulin infusions of 24 or 72 hours h duration in acute stroke patients with hyperglycaemia to establish whether insulin prevents lactate accumulation over the initial 72h after stroke how this relates to stroke evolution and the effect of treatment on stroke size and clinical outcomes at 1 week
Magnetic resonance spectroscopy MRS is a brain scanning technique that allows measurement of brain lactic acid When performed in conjunction with conventional MRI scanning the relationship of lactate accumulation to stroke expansion can be established SELESTIAL is a randomised placebo-controlled trial of insulin infusions of 24 or 72 hours h duration in acute stroke patients with hyperglycaemia to establish whether insulin prevents lactate accumulation over the initial 72h after stroke how this relates to stroke evolution and the effect of treatment on stroke size and clinical outcomes at 1 week
Detailed Description:
Hyperglycaemia is present in 40-60 of patients with acute ischaemic stroke and adversely affects survival and outcome This effect is independent of stroke severity or pathology and is most striking in patients without recognised diabetes in whom the odds of death are increased threefold and the chance of poor functional outcome by 40 Hyperglycaemia remains a powerful independent predictor of outcome even in the face of thrombolytic drug therapy
The adverse effect of hyperglycaemia is hypothesised to be consequent to increased provision of substrate to hypoperfused tissue that is metabolising anaerobically with resultant tissue accumulation of neurotoxic lactic acid In animal models of stroke hyperglycaemia causes increased tissue lactic acidosis and increased recruitment of ischaemic tissue in the peri-infarct region into the final infarct Infarct volumes are higher in hyperglycaemic animals and conversely reducing blood glucose reduces infarct volume Although clinical observational studies suggest protocols that incorporate blood glucose monitoring and control to be beneficial and trials are ongoing to define the impact of routine treatment to maintain euglycaemia the basic pathophysiology of stroke in relation to blood glucose has not been well defined in man Preliminary studies confirm a relationship between blood glucose and lactate concentration in hypoperfused brain tissue but it is unknown whether brain lactate is reduced by control of blood glucose and whether doing so will impact on stroke evolution It has also been found that infarct volume increases more in hyperglycaemic patients treated with recombinant tissue plasminogen activator rtPA
MRI permits non-invasive and serial study of acute stroke pathophysiology In addition to brain structure MRI can define tissue viability cytotoxic oedema seen on diffusion-weighted imaging DWI brain perfusion bolus-tracking perfusion imaging PI vascular integrity MR angiography MRA and tissue metabolism 1H MR spectroscopy MRS In acute middle cerebral artery MCA occlusion evolution of cerebral damage has been defined with these techniques The volume of hypoperfused tissue on PI initially exceeds the DWI lesion and over time the DWI lesion expands to finally incorporate the majority of the PI lesion The region of tissue with normal DWI but abnormal PI is thought to correspond to the ischaemic penumbra the region where hypoperfusion causes electrical failure of neurones with progression to infarction over time due to adverse metabolic and neurochemical events The fate of the penumbra may be determined by treatment - eg it is salvaged by thrombolysis - and it is this penumbral region that is vulnerable to hyperglycaemia-related lactic acidosis
Glucose lowering with insulin is an inexpensive and widely applicable treatment However current clinical trials are compromised by uncertainty over the ability of treatment to influence pathophysiology and have necessarily relied upon a best guess for treatment duration Definition of the biological basis for insulin treatment by MRI criteria and comparative data for different treatment durations would strengthen and inform any positive effect from clinical trials or prevent premature abandonment of this therapeutic modality should trials be neutral
The adverse effect of hyperglycaemia is hypothesised to be consequent to increased provision of substrate to hypoperfused tissue that is metabolising anaerobically with resultant tissue accumulation of neurotoxic lactic acid In animal models of stroke hyperglycaemia causes increased tissue lactic acidosis and increased recruitment of ischaemic tissue in the peri-infarct region into the final infarct Infarct volumes are higher in hyperglycaemic animals and conversely reducing blood glucose reduces infarct volume Although clinical observational studies suggest protocols that incorporate blood glucose monitoring and control to be beneficial and trials are ongoing to define the impact of routine treatment to maintain euglycaemia the basic pathophysiology of stroke in relation to blood glucose has not been well defined in man Preliminary studies confirm a relationship between blood glucose and lactate concentration in hypoperfused brain tissue but it is unknown whether brain lactate is reduced by control of blood glucose and whether doing so will impact on stroke evolution It has also been found that infarct volume increases more in hyperglycaemic patients treated with recombinant tissue plasminogen activator rtPA
MRI permits non-invasive and serial study of acute stroke pathophysiology In addition to brain structure MRI can define tissue viability cytotoxic oedema seen on diffusion-weighted imaging DWI brain perfusion bolus-tracking perfusion imaging PI vascular integrity MR angiography MRA and tissue metabolism 1H MR spectroscopy MRS In acute middle cerebral artery MCA occlusion evolution of cerebral damage has been defined with these techniques The volume of hypoperfused tissue on PI initially exceeds the DWI lesion and over time the DWI lesion expands to finally incorporate the majority of the PI lesion The region of tissue with normal DWI but abnormal PI is thought to correspond to the ischaemic penumbra the region where hypoperfusion causes electrical failure of neurones with progression to infarction over time due to adverse metabolic and neurochemical events The fate of the penumbra may be determined by treatment - eg it is salvaged by thrombolysis - and it is this penumbral region that is vulnerable to hyperglycaemia-related lactic acidosis
Glucose lowering with insulin is an inexpensive and widely applicable treatment However current clinical trials are compromised by uncertainty over the ability of treatment to influence pathophysiology and have necessarily relied upon a best guess for treatment duration Definition of the biological basis for insulin treatment by MRI criteria and comparative data for different treatment durations would strengthen and inform any positive effect from clinical trials or prevent premature abandonment of this therapeutic modality should trials be neutral
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None
Secondary IDs
| Secondary ID | Type | Domain | Link |
|---|---|---|---|
| RD Ref R030295 | None | None | None |
| Grant No TSA 0603 | None | None | None |
| MREC Ref 04MRE0031 | None | None | None |